| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a water-based pigment dispersion excellent in dispersibility in water and dispersion stability with the passage of time, a method for the production thereof, and an inkjet recording liquid excellent in light resistance, water resistance, hue and printed concentration after printing and color reproduction range when printed on plain paper and having good ejection stability in a nozzle. SOLUTION: This aqueous pigment dispersion comprises 100 pts.wt. pigment, 3 to 30 pts.wt. sulfonic acid group-containing derivative and water, wherein the sulfonic acid group-containing derivative has only one sulfonic acid group in the pigment molecule of the same pigment type as the dispersing pigment and the sulfonic aid group forms ammonia or organic amine salt and the dispersion contains <=500 ppm solid metal ions having a valence of at least 2 and the pigment is dispersed in water by electrostatic repulsion due to the sulfonic acid group-containing pigment derivative absorbed on the particle surface.</p> |
